Question

The head loss through the screen is given by  HL = k* (Vt2 –  Va2), where Vt and Va are velocities through and above the screen respectively. What is the value of constant k?

(a) 1

(b) 0.0050

(c) 0.0729

(d) 0.0236

I had been asked this question in an online interview.

My enquiry is from Racks and Screen topic in section Unit Operations for Wastewater Treatment, Preliminary Treatment of Environmental Engineering

Answer 1

Correct answer is (c) 0.0729

Easiest explanation: The expression for the head loss through the screen is given by

HL = 0.0729* (Vt^2 –  Va^2), where Vt  and Va  are the velocities through and above the screen respectively.